Be carefull...Are we talking about the "Bande Nere" of Giovanni de Medici, or about "the black band", which was a Landsknecht company ?
The first was an Italian mercenary company, leaded by Giovanni (composed with pikemen, mounted handgunners etc...); the second was a classic Landsknecht unit, but dressed with a majority of black clothes...
The first fought against the Charles V army; the second fought with Francis I at Pavia, and was totally destroyed and reformed later.